I'll be straight to the point.
Tried installing the update from Windows Update. Stuck at Downloading - 100%.
Tried installing from the Microsoft Update Catalog, it fails with an error message 'This update is not applicable to your computer.'
The file I downloaded had the same title as it was shown in Windows Update.
Tried using the Windows 10 Update Assistant to get the job done, but it showed I'm up to date because I'm already running version 21H1.
Very frustrating. Please help.